Source Driver Segmentation for High-Resolution Display Settling Time
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Solution Overview
Problem
High-resolution display devices require a large number of source lines, which increases load and can slow down the settling time of the gamma voltage, making it difficult to drive the display at high speeds.
Innovation Solution
A display device with a pixel array connected to multiple source lines, a voltage generator for generating reference voltages, and a source driver that outputs source signals, receives return signals, and generates count values based on comparisons with reference voltages to measure DC levels and slew rates of source signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large number of source lines are used for high-resolution display, then display resolution is improved, but settling time of gamma voltage increases and driving speed decreases
Solution Approach 1:
The patent segments the source lines into multiple groups, with each group driven by a separate source driver. This parallel driving approach divides the total driving task across multiple independent channels, allowing simultaneous operation that maintains high resolution while reducing the settling time burden on each individual driver group.
Solution Approach 2:
The patent implements preliminary measurement of DC levels and slew rates before actual image display. By pre-characterizing the electrical properties of source lines and drivers, the system can optimize driving parameters in advance, ensuring that when high-resolution display is activated, the settling time is minimized through pre-configured optimal settings.
2Manufacturing precision
If a large number of source lines are used for high-resolution display, then display resolution is improved, but gamma voltage settling time increases
Solution Approach 1:
By dividing source lines into multiple groups driven by separate source drivers, the patent reduces the capacitive load and electrical complexity that each driver must handle. This segmentation directly reduces the gamma voltage settling time for each group, allowing high-resolution display without the penalty of excessively long settling times that would occur with a single monolithic driver.
Solution Approach 2:
The patent performs preliminary measurement and characterization of source line electrical properties including DC levels and slew rates. This advance knowledge allows the system to pre-optimize gamma voltage generation parameters, ensuring that when high-resolution mode is activated, the settling time is minimized through pre-configured optimal driving conditions.
3Measurement precision
If DC levels and slew rates are measured for each source line, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the measurement function into the existing source driver architecture. The source drivers that already exist for driving the display panels are utilized to perform both driving and measurement functions. By combining these functions, the patent achieves precise DC level and slew rate measurements without adding separate dedicated measurement hardware, thus avoiding increased device complexity.
Solution Approach 2:
The source drivers are designed with multi-functionality, serving both as driving elements for high-resolution display and as measurement instruments for characterizing source line electrical properties. This universal design allows the same hardware to perform multiple functions, eliminating the need for separate measurement systems and maintaining device complexity at acceptable levels while achieving high measurement precision.
Data Source
AI summary
A display device includes a pixel array including a plurality of pixels connected to a plurality of source lines, a voltage generator configured to generate a reference voltage, and a source driver configured to output a first source signal corresponding to a first source line among the plurality of source lines, receive a first return signal corresponding to the first source signal through a second source line positioned adjacent to the first source line, and generate a first count value based on a first comparison result of the first return signal and the reference voltage.